MdeModulePkg: Refine casting expression result to bigger size
There are cases that the operands of an expression are all with rank less than UINT64/INT64 and the result of the expression is explicitly cast to UINT64/INT64 to fit the target size. An example will be: UINT32 a,b; // a and b can be any unsigned int type with rank less than UINT64, like // UINT8, UINT16, etc. UINT64 c; c = (UINT64) (a + b); Some static code checkers may warn that the expression result might overflow within the rank of "int" (integer promotions) and the result is then cast to a bigger size. The commit refines codes by the following rules: 1). When the expression is possible to overflow the range of unsigned int/ int: c = (UINT64)a + b; 2). When the expression will not overflow within the rank of "int", remove the explicit type casts: c = a + b; 3). When the expression will be cast to pointer of possible greater size: UINT32 a,b; VOID *c; c = (VOID *)(UINTN)(a + b); --> c = (VOID *)((UINTN)a + b); 4). When one side of a comparison expression contains only operands with rank less than UINT32: UINT8 a; UINT16 b; UINTN c; if ((UINTN)(a + b) > c) {...} --> if (((UINT32)a + b) > c) {...} For rule 4), if we remove the 'UINTN' type cast like: if (a + b > c) {...} The VS compiler will complain with warning C4018 (signed/unsigned mismatch, level 3 warning) due to promoting 'a + b' to type 'int'. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Feng Tian <feng.tian@intel.com>
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@@ -1,7 +1,7 @@
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/** @file
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Entry and initialization module for the browser.
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Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2007 - 2017, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2014, Hewlett-Packard Development Company, L.P.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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@@ -540,7 +540,7 @@ GetLineByWidth (
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//
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// Need extra glyph info and '\0' info, so +2.
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//
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*OutputString = AllocateZeroPool (((UINTN) (StrOffset + 2) * sizeof(CHAR16)));
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*OutputString = AllocateZeroPool ((StrOffset + 2) * sizeof(CHAR16));
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if (*OutputString == NULL) {
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return 0;
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}
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@@ -2972,7 +2972,7 @@ UiDisplayMenu (
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gST->ConOut->SetAttribute (gST->ConOut, GetInfoTextColor ());
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for (Index = 0; Index < HelpHeaderLine; Index++) {
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ASSERT (HelpHeaderLine == 1);
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ASSERT (GetStringWidth (HelpHeaderString) / 2 < (UINTN) (gHelpBlockWidth - 1));
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ASSERT (GetStringWidth (HelpHeaderString) / 2 < ((UINT32) gHelpBlockWidth - 1));
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PrintStringAtWithWidth (
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gStatementDimensions.RightColumn - gHelpBlockWidth,
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Index + TopRow,
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@@ -3053,7 +3053,7 @@ UiDisplayMenu (
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gST->ConOut->SetAttribute (gST->ConOut, GetInfoTextColor ());
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for (Index = 0; Index < HelpBottomLine; Index++) {
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ASSERT (HelpBottomLine == 1);
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ASSERT (GetStringWidth (HelpBottomString) / 2 < (UINTN) (gHelpBlockWidth - 1));
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ASSERT (GetStringWidth (HelpBottomString) / 2 < ((UINT32) gHelpBlockWidth - 1));
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PrintStringAtWithWidth (
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gStatementDimensions.RightColumn - gHelpBlockWidth,
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BottomRow + Index - HelpBottomLine + 1,
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